The research of the novel bearingless levitation system based on Extended State Observer (ESO)

At present, the classical control strategy of PID is widely adopted in the bearingless levitation system. However, it is hard to realize high performance of levitation control, due to the influence of disturbance, parameters perturbation etc. Aiming at the problem above, the novel bearingless levitation system based on Extended State Observer (ESO) is suggested in this paper. According to the basic principle that ESO can obverse the total disturbance, the mathematical model of the system is built. The stability of the system is analyzed, and the parameters adjustment is demonstrated theoretically, which provides a new method for the levitation control system. Meanwhile, the range of the parameters is specified in the stable region. Moreover, combining with the physical significance of the main parameters, the principle of the parameters adjusting in the nonlinear Extended State Observer is improved. Finally, by simulation, it is verified that ESO makes a significant contribution to the disturbance rejection of the bearingless levitation system, and the validity of the scheme above is proved.